Fireproof paint.



Draftsman,

UNITED STATES PATENT OFFICE.

PHILIP F. APFEL, OF SEATTLE, WASHINGTON, AND RALPH L. EARNEST, OF PORTLAND, OREGON.

FIREPROOF PAINT.

Specification of Letters Patent.

Application filed July 27, 1907.

Patented March 24, 1908.

Serial No. 385,767.

To all whom it may concern:

Be it known that we, PHILIP F. APFEL, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, and RALPH L. EARNEST, a citizen of the United States, residing in Portland, in the countyof Multnomah and State of Oregon, have invented a new and useful Improvement in Fireproof Paint, of which the following is a specification.

Our endeavor in this invention has been to produce a durable and otherwise superior article of fire proof aint adapted to inside use where it will e protected from the weather, and to outside use where it will be eX osed to the Weather.

t consists in the novel composition hereinafter set forth.

In the preparation of our improved paint, we take one part calcined gypsum, one part calcined magnesite, and mix them thoroughly with an aqueous solutionof magnesium chlorid of 18 to 24 degrees Baum producing a mixture of desirable consistency the referred degree of fluidity being substantia ly that usual to paint compounds.

The proportion of gypsum may be consider: ably varied asjthe gypsum gives adhesion, elasticity, whiteness and spreading quality. Iron oXid and iron carbonate or pigments in the form of a fine powder may also be added to the mixture to give color and to increase oXid, and an aqueous solution of magnesium chloridl fireproof paint consisting of gypsum and magnesite in equal parts, iron carbonate, and iron oxid, and an aqueous solution of magnesium chlorid.

PHILIP F. APFEL.

RALPH L. EARNEST. Witnesses as to Philip F. Apfel: ELMER E. HARRISON, CLARE E. MURPHY. Witnesses as to Ralph L. Earnest:

' WALLAoE McOAMANT,

FRED STEINER. 

